eogers



(No Model.) 3 Sheets-Sheet 1. O. D. ROGERS.

DEVICE FOR HOLDING AND GUIDING SCREW BLANKS.

N0.'375,097. PatentedDec. 20, 1887.

WITN EEEEEI.

\NVENTEIR] 6 77a as .1 3 I M 3 sheath-sheet 2.

(No Model.)

0. D. ROGERS.

DEVICE FOR HOLDING AND GUIDING SCREW BLANKS. No. 375,097.

Patented Dec. 20, 1887.

INK/ENTER.

W TN E5555.

IAY/ Z A, N k @276 fl N. PETERS. PhalvLilhogmpher, Washington, D; C.

(No Model.)

0. D. ROGERS.

DEVIGB FOR HOLDING AND GUIDING SCREW BLANKS.

Patented Dec. 20', 1887.

& f inl 3 Sheets-Sheet 3.

NINNGNNI- 21 D 1 Q U I ,M@

bmmw Q. koo ms.

UNITED STATES PATENT OFFICE.

CHARLES D. ROGERSOF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE AMERICAN SORENV COMPANY, OF SAME PLACE.

DEVICE FOR HOLDlNG AND GUIDING SCREW-BLANKS.

SPECIFICATION forming part of Letters Patent No. 375,097, dated December 20, 1887.

Application filed December 24, 1886. Serial No. 5322,5181 (N model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES D. ROGERS, a citizen of. the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Devices for Holdind and Guiding Screw-Blanks; and I do declare the following to be a full, clear, and exact description of the invention, such as will IO enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,and to the letters and figures of reference marked thereon, which form a part of this specifica r 5 tion.

This invention relates particularly to certain improvements in machines for forming the screwihreads on screw-blanks by means of the rolling process, so called; andit consists, essentially, of a blankholding guide adjustably mounted between the adjacent working-faces of the thread-forming dies, all as will be more fully hereinafter set forth and claimed.

The object of my present invention is to pro vide means for holding screw-blanks in a vertical position while the latter are being acted upon by the thread-forming dies, the screws thus held or guided and produced being su- 0 perior to rolled thread screws as heretofore made by machines unprovided with means for vertically retaining the blank in position. It is practically found in threading the screws that a great number of them are rendered in- 5 ferior or worthless, owing to the fact that the attendant, or the mechanical feeder when used, fails to properly enter the blanks be tween the dies.

In the three accompanying sheets of drawings, Figure 1 represents a side elevation of a machine adapted to form screw-threads on. screw-blanks and provided with my blankholding device. Fig. 2 is an enlarged transverse sectional view taken on line as w of Fig.

5 6. Fig. 3 is a detached view of the rear guideplate. Fig. 4 is a similar View of the front guide-plate. Fig. 5 is a view of the upper plate, adapted to serve as a gage for limiting the upward movement of the blank, each 0f said plates being provided with means for adjusting the position thereof with reference to -ing horizontally therein.

the screw-blank. Fig. 6, Sheet 2, is an enlarged side view of a portion of the machine, showing the screw blank retained by the guide in its normal position. Fig. 7 isasimi- 5 lar View, showing the rear die advancing and the guide with its blank also traveling ahead, the blank at the same time having the screwthread rolled therein. Fig. 8, Sheet 3, represents a side view of two traveling dies, one above the other, with a blank (in section) ly- Fig. 9 is a transverse sectional view showing a means for centralizing and retaining a blank in position while being acted upon by two traveling dies to form a screw-thread thereon. Fig. 10 is a reduced side view showing traveling dies adapted to roll a V-shaped groove into the peripheral surface of a rod. Fig. 11 is a transverse vertical sectional view showing a rod retained in position laterally while being submitted to the action of two traveling dies, the latter adapted to roll or impress a V-shaped groove into the rod. Fig. 12 is a partial sectional view showing a screw-blank vertically 7 retained in position, the device permitting the blank to readily turn on its axis, but at the same time preventing lateral movement while being acted upon by the two moving dies. Fig. 13 is a front elevation of the device rep- 8o resented in Figs. 6 and 7, the difference being that the guides are adjustably secured to a stationary part of the machine in lieu of the carrier, and both dies are adapted to travel; and Fig. 14 is a similar view of the stationary device with the steadying-lever and dog for operating the same removed.

In all the drawings it will be observed that the blank or rod is retained in position or centralized in such manner that it is at the same time adapted to turn freely on its axis. In case the guide be dispensed with the blanks then very frequently intermittently slip or slide along between the faces of the dies, thereby, in the making of screws, producing thin 5 and otherwise imperfect threads.

The immediately'following description re-- lates to a machine adapted to form a screwthrea-d upon blanks by means of impressingdies.

A designates the improved machine as a whole.

a Z2 indicate the bed or frame and the supporting-legs, respectively.

8 indicates the driving-shaft, mounted in bearings secured to the top of said bed.

9 is a stationary guide secured to the bed.

D, as drawn, indicates one of the threadforming dies, the same being secured to the front side of the bed or frame.

D indicates the suitably-mounted traveling die, its grooved face an forming the counterpart of the adjacent face of the stationary die D. The die is further provided at its rear end with a short vertical arm, Fig. 1, to which is jointed the connecting-rod 0-, which in turn is jointed to the disk or crank d, secured to the driving-shaft 5. By means of this arrangement a rectilinear reciprocating movement is imparted to the die, the stroke being about twice the length of the die D.

The following refers especially to the guid- 1ng device for the blanks, which forms the subject of the present invention.

0 designates a carrier, constructed to slide freely in an endwise direction in the stationary guide 9. The rear end of the carrier is jointed to a connecting-rod, c, a pin mounted in the revolving crank-disk d and passing through the rear end of said rod 0 serving to impart a reciprocating motion to the carrier, the stroke being just one-half that of the die D, before described.

H indicates the rear guideplate, made of thin steel, the same being adj ustably-seeured to the front face of the carrier by means of screws 7:, passing through the elongated screwholes u. The front end of said plate is extended, as at t, terminating in the vertical edge 6. Immediately below said extension the plate is cut away at e, and having the edge 6 thereof made at an angle with the lower edge of the plate. A hub, Z, is formed in the upper forward portion of the plate, all as clearly shown in Fig. 3.

H, Fig. 4, designates the forward steel guideplate, the same having an elongated opening, h, thereby adapting the plate to be adj ustably secured to the carrier. The rear edge of the lower half of this plate consists of the two vertical faces 6 e, terminating in the notched portion 0 The offset edge e, in conjunction with that of the plate H,bears against opposite sides of the plain or unthreaded portion of the shank of the screw, the lateral extension 0 being equal to the height of the screw-thread. To the face of the plate H is adj ustably secured the vertical gage-plate H", having its lower end bent rearwardly, as at 1', thereby forming a vertical stop to the screw.

L designates a two-arm or bell-crank lever, the same being pivoted in front to the hub Z of the plate H by means of the pin Z. The lower or vertical arm of said lever is bent rearwardly at Z thereby causing its lower portion to travel in the vertical plane with the steel plates H H, the thickness of the arm Z being substantially the same as that of said plates. The forward edge, 6 of the arm Z is slightly beveled, so that its lower end is in line with the forward edge, e, of the plate H,

as clearly indicated in Fig. 6. The rear edge of the arm is also beveled and adapted to engage the angularly-cut edge e of the plate. The upper arm, Z, of the lever L extends in advance of the arm Z and is provided at its free end with the enlargement m, the latter engaging the upper surface of a block, it, secured to the stationary die D, the said surface consisting of the level portion or and the camshaped or beveled portion a.

In the machine illustrated herewith the adjacent working-faces of the dies D D are of the same length, the former die being stationary,while the latter travels at a'rate of speed which is twice that of the forward movement of the screw-blank upon its axis; or, in other words, the natural movement of the blank (when embraced between the two dies) is exactly one-half that of the traveling die. Therefore the speed of the carrier 0 is made the same as that of the screw-blank. go

The operation is as follows, assuming, first, however, that the machine is provided with suitable driving mechanism for actuating the movable die D and the carrier 0: Now, the several parts being in the normalpositionrepresented in Fig. 6, (the two crank-pins being at the same time on the dead-center,) a blank, I), is then placed between the edges 0 of the front and rear plates, H H, which have previously been adjusted to the size of the wire forming the blank, the head 12 extend ing up into the space 0", while the point p of the blank rests upon the top surface, s", of the bed.

It will be observed that the arm Z of the 05 pivoted lever L rests upon the horizontal surface n" of the stationary block a, thereby bringing the lower forward end of the other arm, Z against the blank. Now, in revolving the shaft 3 motion is imparted to the said car- I I0 rier and die D, the former, with its attached plates and lever, thereby being forced ahead, which causes the blank to traverse the distance i and engage the stationary die at the same instant that the rear or movable die,hav- 15 ing first traveled the distancetplust, engages the opposite side of the blank. The continuous rotation of the shaft next causes the dies to form the gradually-enlarging screw-thread on the blanks shank. The boss on of the leverL I20 meanwhile in advancing follows the surface of the block a, the inclined portion nthereof being so proportioned or formed that the edge e" of the lower arm, l gradually assumes a perpendicular as the screw thread is formed, I25 thereby positively retaining the blank or screw in a vertical position during the thread-forming operation. It will be seen that the slight rearward pressure of the screw is borne by the said edge 0 in conjunction with the opposed 13o contact of the boss m, sliding along the block it. As the carrier, die, &c., farther advance, the thrust of the screw is transmitted to the rear edge of the arm Z then bearing against the inclined surface 6 of the rear steel plate, H. The final forward movement of the said traveling parts carries the then finished screw beyond the front end of the stationary die, after which the screw may be automatically or otherwise removed from the guide. The backstroke now returns the die D, 850., to the nor .mal position to receive another blank, 12, as before described. (See Fig. 6.) By means of the screws 70 the steel guide-plates may be ad justed so as to receive other sizes of blanks.

Obviously the thread-formingdies are to be adj ustably mounted. The details in this and other respects, however, are not specifically pointed out or shown, as the same, combined in the machine as a whole, will form the subject of a subsequent application for Letters Patent to be filed by me in the United States Patent Offiee.

It is obvious that the dies may be so arranged as to receive the blanks in a horizontal position, as shown in Figs. 8 and 9. In these and the succeeding figures both of the dies are represented as traveling, the blank being stationary with reference to the forward movement of the dies, although freely revolving upon their axes.

In Figs. 10 and 11 ears 11' extend up from the base a, which are transversely drilled to receive a red, I), the latter having a V-shapedgroove, 9, rolled or impressed therein by means of the gradually-increasing raised V- shaped portion of the oppositely mounted and driven dies D.

In Fig. 12 the screw-blank b rests upon an adjustable step, a, while the head is centered by the cone-shaped hood (1, mounted in a stationary base or frame, a", a spring serving to maintain the guide or hood in close contact with the blank.

By simply securing the gnideplates H H to a stationary arm or vertical extension, 10,

formed on the bed a, and then moving the dies D D toward each other, as shown in Fig. 13, the action of the lever L upon the block it and blank is substantially the same as hereinbefore described with reference to Figs. 6 and 7 wherein the die D is stationary and the guide-plates are secured to a carrier, 0.

It is'apparent now that' a blank screw or rod may by means of my invention be placed between the working-faces of a pair of suitably mounted and operated dies and positively retained in the same relative position during the entire stroke or movement of the die or dies, the device in nowisepreventing the work at the same time from freely turning on its axis. Heretofore in order to effect this result, even approximately, the working-faces of the dies have been roughened; but this is found to be ineffectual. Such roughening, moreover, is necessarily impressed into the surface of the screw or rod, thereby producing screws, &c., of an inferior quality. Even with v the use of such roughened dies, unless the attendant be very careful to place the work exactly at right angles with the faceof the dies,

the finished product will be inferior or wholly unfit for use. By means of thus improperly placing the blanks the dies in working are frequently broken or rendered nnserviceable.

Having thus described my invention, I claim 1. The combination, with suitably mounted and operated forming-dies, one of which may be stationary, of a combined blank holder and guide consisting of a fixed plate and a pivoted lever portion mounted on acarrier,whereby a blank is maintained in position parallel to the adjacent faces of the dies, substantially as specified.

2. The combination, with two snitablymounted thread-forming dies and mechanism for operating the same, of adj ustably-mounted guide-plates and a pivoted lever adapted to coact with said plates, by means of which a screw blank or rod is maintained parallel to and between the working-faces of the said dies, substantially as hereinbefore described.

3. In a machine of the class hereinbefore re ferred to, the combination, with two oppositely mounted and operated thread-forming dies, of adjustably-mounted plates, as H, H, and H a pivoted lever, as L, and a carrier to which said plates are secured, arranged and adapted to maintain a blank in position parallel to and between the working-faces of said dies, substantially as shown and specified.

4. In a machine for rolling or impressing screw threads into a blank, the combination, with the suitably mounted and operating threading-dies,of a screw-blank guide mounted to travel between said threading-dies, and mechanism for operating the blank'gnide, substantially as described, and for the purpose set forth.

.5. The combination, with the thread-forming dies mounted to impress a screw-thread into ascrew-blank, of the blank-guide,hereinbefore described, provided with means for adj usting the same to different sizes of blanks, and mechanism for imparting a reciprocating movement to said guide, substantiallyas shown, and for the purpose specified. 6. In a screw-threading machine of the class hereinbefore described and shown, the combination, with the stationary thread-forming die D, the oppositely-mounted traveling threadi'orming die D, and means for reciprocating the same, of a carrier, 0, means for reciprocating the carrier, and the blank-guide adjustably secured to said carrier, substantially as and for the purpose set forth.

7. The combination, with the stationary thread-forming die D, having an irregular or cam-shaped upper surface, as a nflof the guidecarrier 6, means for reciprocating the carrier, and the screw-blank guide consisting of plates H HH, and pivoted lever L, adjustably secured to the carrier, substantially as shown and hereinbefore set forth.

8. The combination, with the suitablymounted thread-forming dies D D, a block,

a, secured to the die D, and the guided reciprocating carrier 0, of the notched front and rear plates, H H, adjustably secured to said carrier, an adj ustablysecured plate, H adapted to limit the upward movement of the blank, and the pivoted two-arm lever L adapted to simultaneously engage the block 02 and the screw-blank, all constructed,arranged, and operating substantially as shown, and for the purpose hereinbefore set forth.

9. The combination, with the movable threadforming die D, the stationary die D, having an attached block, n, and the carrier 0, having the screw-blank-holding plates H H H adjustably secured thereto, of the two-arm 1ever L. pivoted to the carrier, having its front arm, Z", engaging the block n at the same time that its other arm engages the lower portion of the screw-blank.

10. The plates H H, each having the adjacent edges or ends 6 adapted to receive a screw-blank, and means for adjustably securing the blanks to a carrier, substantially as shown and set forth.

11. The combination, with the adjustablymounted plates H H, adapted to receive a screw-blank between their adjacent ends, said plate H further having its front lower corner cut away, as at 6 of the pivoted two-arm 1ever L, having the lower port-ion of its vertical arm adapted to rest against the edge e of the plate I-I prior to the completion of the screwthread.

In testimony whereof I affix my signature in presence'of two witnesses.

CHARLES D. ROGERS.

Witnesses:

CI-IARLEs IIANNIGAN, WVM. R. DUTEMILE. 

